3 ms·

If you could find any alien living with head and legs, that would be very stranger than finding alien life itself, or life on earth come from the same origin.

• outworlder 7y ago
  Not entirely. Legs have independently evolved multiple times on Earth, as have heads (or things that are similar to heads). It pays to have a lot of sensory organs on an appendage that can articulate – said sensory organs being close to the brain is also an advantage, assuming you have one single central brain. And 'legs' are good way to achieve locomotion over uneven terrain. Even on Earth that was done using different mechanisms: we use muscles attached to tendons, spiders use hydraulics. Even though an alien lifeform could conceivably have a 'head' and have 'legs', they would probably look nothing like what we have here. For a good story about how some alien lifeform would look like, I would recomend reading Blindsight: https://rifters.com/real/Blindsight.htm https://rifters.com/real/Blindsight.htm The author uses some of his marine biology background to design the lifeforms. I think he does a pretty good job at trying to identify mechanisms which would hold true anywhere, but also making the result completely alien.